Cornelius f



{No Model.)

G.F.HORNBEGK. LIFTING JACK. No. 473,002. Patented Apr. 19, 1 92.

- I 4 wvemtoz UNITED STATES. PATENT Orrioa.

CORNELIUS F. HORNBECK, OF OIVEGO, NEW YORK, ASSIGNOR OF ONE-HALF TOEDWARD D. COBURN, OF SAME PLACE.

LlFTlNG-JACK.

SPECIFICATION forming part of Letters Patent No. 473,002, datedApri1'19, 1892. Application filed December 28, 1891. Serial No. 416,352.(No model.)

To all whom it may concern; desirable manner, or they may be integral Beit known that I, CORNELIUS F. HORN- with the standard, and said platesproject BECK, a citizen of the United States, residing rearward to formbearings for thelever-shaft at Owego, in the county of Tioga and Stateof -b. The rear ends I) of these plates or bear- 55 5 New York, haveinvented certain new and usein gs are held rigidly in place bybrace-rods b ful Improvements in Lifting-Jacks; and I do secured to thebase. The lifting-bar C is arhereby declare the following to be a full,clear, ranged against the rear face of the standard, and exactdescription of the invention, such as and it is adapted to bereciprocated up and will enable others skilled in the art to whichdown-or back and forth by the lever and pawls. 6o

' to it appertains-to make and use the'same. Said lifting-bar is guidedin its movement be- My invention relates to improvements in tween thebearing-plates and guide-plates D, lifting-jacks; and its object is toprovide a having logs or projections 01, whichmay be simple andefiective construction and arrange provided with friction-rollers tobear against ment of part-s wherebythe lifting-bar may be the rack-barand hold the lifting-bar in a ver-- 65 elevated or lowered by simplyvarying the ostical position. On the rear face of the liftcillation ofthe operating-lever. ing-bar a plate 0 is secured, and this plate car-Withthese ends in view my invention conries the rack-teeth c, whichareintegral with sists of a standard mountedinasuitable base, saidplate, the bar being separate from the a lifting-bar guided within thestandard, a plate and fastened in place in a suitable man 70 2olever-socket pivoted in bearing-plates on the ner, or the bar andrack-teeth maybe integral. standard and carrying the lifting andlowering The lever-socket E is pivotally secured on pawls, andadogpivotally secured on the bearthe shaft 12, and it is bifurcated toprovide ing-plate and adapted to be operated by the theforwardly-extending side pieces 6. A lever-socket to adjust the pawls,so that the transverse bar e'is secured in the ends of the '7 5lifting-bar may be lowered. side pieces a, and'the smaller pawl F ispiv- My invention consists, further, of certain oted thereon in asuitable manner. The details of construction and arrangement of largerpawl G is pivoted on the shaft b, and parts, as will be fullydescribedand claimed it acts as a holding-pawl, either in theoperahereinafter. tion of elevating or lowering the lifting-bar, 8o Toenable others to more readilyv understand while the smaller pawl-Fperforms the fume my invention I have illustrated the same in tion ofelevating or lowering the lifting-bar, .the accompanying drawings, inwhichthe pawl G simply holding said bar while the Figure 1 is a sideelevation of the improved smaller pawl F is obtaining a new hold. Thejack, partly broken away. Fig. 2 is a side lever d is inserted in thesocket in the usual 85 v view, partly in section, showing the'jack inmanner, and the operation of elevating the position when the lifting-baris beinglowered lifting-bar is very simple, the pawl G holding and thedog in engagement with the lug on the lifttng-bar steady while the leveris bethe larger pawl. Fig. 3 is a transverse sec ing elevated and thesmaller pawl F lowered tional View on the line a: a: of Fig. 2, and Fig.to take anew hold on the lifting-bar. v oo 40 4 is a detail View. of thedog. In the operation of elevating the lifting-bar In the drawings likeletters of reference de- I it must be noted that the oscillation of thenote corresponding parts in the several figoperating-lever is confinedwithin the limits ures. i necessary to operate the smaller pawl F overThe frame consists, essentially,of a suitable one tooth of the rack-bar.As before stated, 5 base A,'having the socket a, in which the I can alsolower the lifting bar after it is elestandard a is secured; but it isobvioust-hat vated by operating the lever (1, simply givthe standard maybe supported in any other ing it a wider range of oscillation. Toacsuitable manner and so arranged that the complish this importantfeature I provide a lifting-bar may operate horizontally, if dedog H,which is pivotallysecured on one of 100 sired. At or near the top of thestandard are the bearing-plates, and extends rearwardly the plates B,which are fastened thereto in a above one of the side pieces 6 of thesocket to impinge against a lug or projection h on the larger pawl G. Bythis construction and arrangement when the lever is lowered its fulllimit the side piece of the socket, being on the opposite side of thefulcrum, strikes against the dog H and raises it up until it impingessaid dog as the pawl descends and releases, the pawl G so that it willfall back into engagement with the rack-bar again. The lever vent thepawl G from becoming displaced, 1

is now elevated to its highest limit and the smaller pawl F is releasedfrom its engage ment with the rack-bar by the projection 72, whichslides down over the segmental upper edge of the dog and into a slot orrecess h therein. The larger pawl G is now sustaining the rack-bar, andas the lever is lowered the projection h in the recess h assists inelevating the dog to its position in contact with the lug or projectionh on the pawl G to release the latter fromthe rack-bar. To preprovide astop I on one of the bearing-plates adapted to engagage with the lug orprojection on said pawl.

It will be readily observed that the operation of the jack either inelevating or lower-- ing the lifting-bar is extremely simple, and byvarying the oscillation of the lever the load supported on the rack-barmay be elevated or lowered.

I am aware that changes in the form and proportion of parts and detailsof construction can be made without departi'ng'from the spirit orsacrificing the advantages of my invention-as, forinstance, the dog'maybe pivotall'y secured on either side of the bearingplates or directly tothe standard, or I may use twodogs instead of one.

Having thus fully describedmy invention,

what I claim as new, and desire to secure by Letters Patent, is

1. In a lifting-jack, the combination, with a base and a standard, of alifting-bar, a lever fulcrumed in bearings on the standard, the pawlscarried by said lever and adapted to engage with the lifting-bar oneabove the other, the dog H, pivoted on one bearing-plate and having aslot or recess h" and adapted to be elevated to engage with a log on thelarger pawl to hold it out of engagement with the lifting-bar, and theprojection h on the smaller pawl, arranged to fit in said slot or recessto elevate the dog when-said pawl is raised and to disengage the dogwhen the pawl is lowered, substantially as described.

2. In a lifting-jack, the combination, with a base and a standardmounted thereon, of a lifting-bar, the bearing-plates on said standard,the lever fulcrumed in said bearingplates, the pawls carried by thelever, and a dog v pivoted on the bearing-plates and adapted tobe'raised by the lever to engagewith'a lug on one pawl when the lever islowered to its limit to lower the lifting-bar, substantially asdescribed. p v

3. In a lifting-jack, the combination, with a base and a standardmounted thereon, of a lifting-bar having a rack, the bearing-plates onthe standard and extending in rear thereof,

one bearing-plate and-adapted to be raised by the lever to engage withthe lug on said pawl, and another lug on the smaller pawl to disengagethe dog as said pawl descends, sub- I stantially as described.

In testimony whereof Iatfix my signature in presence of two witnesses.

OORNELIUS F. HORNBEOK.

VVitnessesz v WILLIAM E. ISENBERY, T. BJOAKLEY.

